That part about offering more money to get it, I only agree partially. Only 25% of WGs I BBed were a result of extra cash. Mind you, I wasn't the type to go looking for BBFS, so I can't speak for the experience with those that advertise openly. All the other ones I had never asked for extra and didn't ask for tips after. I did tip them on my own accord in the end, though... No idea if they would've asked if I tried to leave without giving one.
One K ML even refused my tips on all occasions I saw her. That was a strange one, came and went very quickly, left me wondering... Was there more to it that I could've got? Who knows...
The other one about becoming a regular, I downright disagree. If she likes you, you'll get it on the first or at most second go. If she don't like you or she has her own strict rules, you won't get nothing even after a hundred goes.
If a WG really turns you on, by all means be a regular, just don't do it with the expectation that somehow she will change her mind or rules after n-number of visits. You will be disappointed.